American capitalism is derided for its superficial banality, yet it has unleashed profound, convulsive social change. Condemned as mindless materialism, it has burst loose a flood tide of spiritual yearning. The civil rights movement and the sexual revolution, environmentalism and feminism, the fitness and health-care boom and the opening of the gay closet, the withering of censorship and the rise of a "creative class" of "knowledge workers" — all are the progeny of widespread prosperity.